In SolidWorks there are several places to adjust the color or appearance of a face, feature, body, component, etc.  One tip that will make life easier in SolidWorks is to use the Appearances button on the context toolbars.  For those not familiar with the terminology the context toolbars (sometimes known as in-context) are graphical toolbars that only appear when you select items in the graphics area or FeatureManager design tree.  Context toolbars appear and provide access to frequently performed actions for that context.  To change an appearance just click on any face in the graphics area then click on the Appearance button in the Context toolbar.

You’ll notice that it lists the appearance in a hierarchy format.  Think of this list as an interactive table and click on the area where you want to add or modify an appearance.  For example, if you wanted to add color to just the face click to the blank area directly to the right of the face row. (red arrow in image)